United States Department of Transportation
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Edition:November 1, 1960 to September 1, 1962
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Abstract:The objective of this project was to determine how the durability of paving asphalts can be improved. Sixteen chemical additives from two different manufacturers were evaluated as antioxidants for 85-100 penetration paving asphalts. The following conclusions are drawn from the data given in this report: (1) Chemical compounds are available which serve rather effectively as antioxidants and free radical inhibitors when added to asphalt cements; (2) The retardation of hardening by these chemicals is most effective in asphalts that are highly susceptible to oxidation; (3) One to two weight percent of the additive material appears to be the optimum concentration; and (4) The additives investigated are more effective against oxidation in the absence of light than against the severe hardening caused by photo-oxidation.
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